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802.11 Protocol Architecture
or, you could simplify the formula a little to say the following:
EIFS (µs) = (2 x aSlotTime) + (2 x aSIFSTime) +
aPreambleLength + aPLCPHeaderLngth + (8 x 14)
ACKSize is the length, in bytes, of an ACK frame. The 802.11-1999
standard does not intend for the 8xACKSize to be converted to bits, but
rather that the number yielded by 8xACKSize (8x14=112) be taken as
units of microseconds (since 1 Mbps was the lowest mandatory rate of
802.11-1999). The same is true of PLCP Preamble Length and PLCP
Header Length.
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